using the national grid

1 The National Grid provides a unique reference system, which can be applied to all Ordnance Survey maps of Great Britain, at all scales. 2 Great Britain is covered by 100 kilometre grid squares, each grid square is identified by two letters, as shown in diagram A. Using the National Grid 3 On Ordnance Survey maps these squares are further divided into smaller squares by grid lines representing 10 kilometre spacing, each numbered from 0 to 9 from the south-west corner, in an easterly (left to right) and northerly (upwards) direction, as shown in diagram B. 4 Using this system you can identify a 10 kilometre grid square. For example, here is TL63. After the letters you quote the eastings (6) first, then the northings (3). If you have trouble remembering, say … Stairs the Up Along the hall, THEN 5 On OS Landranger Maps you can find the two grid letters TL on the legend, or on the corner of the map, and the grid has been further divided into 1 kilometre intervals, as shown in diagram C. You can estimate distances between the grid lines to give a more precise reference. 6 Turn the page and see how easy it is to use a 6-figure grid reference to pinpoint a place on the map…

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Using the National Grid

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1 TheNationalGridprovidesauniquereferencesystem,whichcanbeappliedtoallOrdnanceSurveymapsofGreatBritain,atallscales.

2 GreatBritainiscoveredby100kilometregridsquares,eachgridsquareisidentifiedbytwoletters,asshownindiagram A.

UsingtheNationalGrid

3 OnOrdnanceSurveymapsthesesquaresarefurtherdividedintosmallersquaresbygridlinesrepresenting10kilometrespacing,eachnumberedfrom0to9fromthesouth-westcorner,inaneasterly(lefttoright)andnortherly(upwards)direction,asshownindiagram B.

4 Usingthissystemyoucanidentifya10kilometregridsquare.Forexample,hereisTL63.Afterthelettersyouquotetheeastings(6)first,thenthenorthings(3).Ifyouhavetroubleremembering,say…

Stairs the Up Alongthehall,THEN

5 OnOSLandrangerMapsyoucanfindthetwogridlettersTLonthelegend,oronthecornerofthemap,andthegridhasbeenfurtherdividedinto1kilometreintervals,asshownindiagram C.Youcanestimatedistancesbetweenthegridlinestogiveamoreprecisereference.

6 Turnthepageandseehoweasyitistousea6-figuregridreferencetopinpointaplaceonthemap…

UsingtheNationalGridcontinued

The6-figuregridreference

7 The6-figuregridreferenceisveryusefultolocateaparticularplaceonamap.

8 Byestimatingtheeastingsandnorthingstoonetenthofthegridinterval,youcanspecifyafull6-figuregridreference,accuratetowithin100metresontheground.

9 Allyoudoisestimatehowmanytenthsawayfromthegridyourpointfalls.Forinstance,thepointindiagram Dis3tenthseastofgrid62and7tenthsnorthofgrid31.

10Onceagain,readingfromthesouth-westcorner,quotealltheeastingsfirst,thenthenorthings.The100-metregridreferenceofthepointinthediagramisshownlikethis:TL623317.

11Hereisanextractfroma1:50000scalemap.UsetheNationalGridreferencesystemtofind:

The Church at TL683365 The Windmill at TL726350 Mill Farm at TL701352

General enquiries: +44 (0)8456 05 05 05Textphone: +44 (0)23 8079 2906 (Deaf and hard of hearing users only please)

[email protected]

Published by Ordnance Survey, Romsey Road, SOUTHAMPTON, SO16 4GU.Ordnance Survey, the OS Symbol, OS and Landranger are registered trademarks of Ordnance Survey, the national mapping agency of Great Britain.

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